Question about Cars & Trucks

1 Answer

94 transport engine miss

94 pontiac transport 3.8 v6.. engine miss from idle to upper rpms. tested injectors, voltage and ohms ok, tested coils ..ok ( they really are shocking), Cyl 5 seems to be dead(most of the time) swapped injector with a good one, NO CHANGE.. new ECM.. NO CHANGE, new plugs and wires..NO CHANGE... Help im pulling my hair out and I dont have alot left to pull on

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 42,190 Answers

Have a compression test done on the engine. Check for burnt valve or bent valve on that cylinder.

Posted on Apr 28, 2013

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 331 Answers

SOURCE: dead cylinders 2003 sebring

it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke.
the firing order is 1-3-4-2.
they should be hooked like this.


Posted on Jan 24, 2009

  • 1 Answer

SOURCE: I am getting a misfire

Here is a copy of the "Policy Adjustment" that I took to the dealer with me this morning. Hope this helps any of you.

Subject: Special Policy Adjustment - Catalytic Converter #05551 -(09/14/2005)
Some customers of 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; and Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 - VIN E) or 3.8L (RPO L36 - VIN K) V6 engine, may experience a condition where the vehicle exhaust catalytic converter is replaced due to complaints of lack of power or illumination of the Malfunction Indicator Lamp (MIL). This may be due to the front endcone insulation from the catalytic converter breaking away and blocking the front of the first catalyst brick and preventing the free flow of exhaust gas through the converter.
Special Policy Adjustment
This special policy covers the condition described above for a period of 10 years or 120,000 miles (190,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. The repairs will be made at no charge to the customer.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after September 15, 2005 are covered by this special policy and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to September 15, 2005 must be submitted to the Service Contract provider.
Vehicles Involved
Involved are all 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 - VIN E) or 3.8L (RPO L36 - VIN K) V6 engine and built within the following VIN breakpoints:
Monte Carlo
Grand Prix
Monte Carlo
Grand Prix
Parts Information
Parts required to complete this special policy are to be obtained from General Motors Service Parts Operations (GMSPO).
Part Number
Qty/ Vehicle
Converter, Catalytic (L36 engine)
Converter, Catalytic (LA1 engine)
Gasket, Catalytic Converter (Converter to I-Pipe, both)
Gasket, Exh Manif Pipe (L36)
Gasket, Exh Manif Pip (LA1)
Customer Notification
General Motors will notify customers of this special policy on their vehicles (see copy of typical customer letter included with this bulletin - actual divisional letter may vary slightly).
Service Procedure
Catalytic Converter Inspection
Begin the inspection by reviewing the condition described by the customer. Refer to "Description and Operation," SI document 657895, to help you determine the correct symptom diagnostic procedure when a malfunction exists.

Posted on Feb 08, 2009

  • 1348 Answers

SOURCE: 2002 ford ranger 3.0 is missing on 2 cyl plugs ok injectors ok new coilpack

do a compression test,as the intake manifold,like alot of fords is no good.

Posted on May 22, 2009

  • 1486 Answers

SOURCE: 1983 buick skyhawk 2.0 with TBI not sparying fuel

change the crank sensor.No the ECM has no internal oil components

Posted on Jul 08, 2009

  • 4669 Answers

SOURCE: 1999 Grand Am 3400 v6 misfire.

I was asking about the pushrods because I had this problem with one of these engines that had a bent push-rod. I robbed a push-rod out of an older 3100 and it was just a fraction of an inch longer which bottomed out the lifter. I figured it out by removing the valve cover and loosing the rockers when it was running and it smoothed out. I'm guessing you checked for vacuum leaks already. How about injection pulse on the number 6 cylinder when running. Another thing you could check is running compression. You said you checked compression but did you just check cranking compression or did you check running compression too.

Posted on Apr 09, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2003 pontiac aztek shuts off when its in idle

Could have a vacuum leak , a problem with the IAC - idle air control motor !
Rough, Unstable, or Incorrect Idle and Stalling
DEFINITION: Engine runs unevenly at idle. If severe, the engine or vehicle may shake. Engine idle speed may vary in RPM. Either condition may be severe enough to stall the engine.
Refer to Diagnostic System Check - Engine Controls .

Refer to Intermittent Conditions before starting.

Search for bulletins.

Observe the owners driving habits.

Fuel System
Test the fuel system circuits for proper operation. Refer to Fuel Pump Electrical Circuit Diagnosis .

Test for low fuel pressure. Refer to Fuel System Diagnosis .

Test for faulty fuel injectors. Refer to Fuel Injector Balance Test with Special Tool , Fuel Injector Balance Test with Tech 2 , Fuel Injector Solenoid Coil Test test procedures.

Inspect for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

Inspect for fuel in the pressure regulator vacuum hose.

Ensure each injector harness is connected to the correct injector/cylinder.

Inspect for any items which may cause an engine to run rich, long term fuel trim is significantly in the negative range. Refer to Diagnostic Aids for DTC P0172 .

Inspect for any items which may cause an engine to run lean, long term fuel trim is significantly in the positive range. Refer to Diagnostic Aids for DTC P0171 .

Test for conditions which cause an incorrect idle speed.

Throttle body tampering, excessive deposits, or damage--Refer to Fuel System Description .

Restricted air intake system

Large vacuum leak

Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the MAF sensor and the throttle body.

Inspect crankcase ventilation valve for proper operation.

Inspect the throttle position (TP) sensor and related wiring. Refer to DTC P0123 .

Monitor the 24X crank sensor and the CMP sensor signal present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor A and CMP sensor circuits for intermittents. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Monitor the 3X parameter on the scan tool. If the 3X is not responding, inspect the CKP sensor B and circuits for intermittents. Inspect the ignition control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted, they may not set a diagnostic trouble code (DTC) immediately, but are capable of causing driveability complaints. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test the exhaust gas recirculation (EGR) system for proper operation. Refer to Exhaust Gas Recirculation (EGR) System Description .

Inspect the Transaxle Range Switch input with the vehicle in drive and the gear selector in drive or overdrive

Ignition System
Inspect for proper ignition voltage output using the following steps:

Attach the J 26792 Spark Tester to engine ground.

Connect the spark plug end of the spark plug wire to the J 26792 . Leave the other end of the spark plug wire connected to the coil being tested.

Connect the spark plug end of the companion spark plug wire to ground. The companion spark plug wire is the wire attached to the corresponding coil tower.

Crank the engine while observing the J 26792 . A spark should be observed.

Repeat the above steps for each coil.

If spark is not present at the coils, inspect for the following conditions:

Coils--Cracks, carbon tracking/arcing, or a resistance value outside the specified range

Coil Resistance
5000-8000 ohms (5K-8K ohms)
Spark plug wires--Signs of arcing, cross firing, cracks, carbon tracking, plug boot damage, pinched, improper routing, or a resistance value outside the specified range

Spark Plug Wire Resistance
9 686 ohms per meter (3,000 ohms per foot)
Important: : Spraying the secondary ignition wires with a light mist of water may help locate an intermittent problem. Ignition voltage will arc to ground when a secondary component is faulty.

Defective ignition module

Ignition system wiring--Loose ignition module feed or ground connection, or damaged system wiring

Remove spark plugs and inspect for the following conditions:

Fouled plugs



Improper gap

Burned or damaged electrodes

Improper heat range or reach

If spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs. Refer to Spark Plug Inspection .

Sep 27, 2015 | Pontiac Cars & Trucks

2 Answers

Need to check the fuel injectors on my 1990 buick lesabre v6 3.8l

You will need a fuel injector testor, about a $100, and a fuel pressure guage, about a $100, to flow test the injectors.

You can ohm check them with an ohm meter to see if one or more has shorted windings. Remove the electrical connector and test between the two pins. They should all be about the same ohms. If one is significantly lower than it is probably bad. Its best to check them when they are hot (after the engine has warmed up).

Nov 29, 2012 | 1990 Buick LeSabre

1 Answer

1998 chevy monte carlo 3.1 how to test coil in engine

V6 engines have a "waste spark" design-one coil fires the plug on 2 cylinders.You can test the coils by reading across the plug wire "towers".You should get roughly the same readings on each coil(I think it was about 9 ohms,but it has been a while).If they read about the same,you could remove the coils and put a 12v test light across the primary(low voltage)terminals,you should get a flashing light when you crank it.If no light,see if you are getting injector pulse(a "noid" light is a test light for this purpose,you could rig a small Christmas tree light bulb to the injector plug as a substitute).If you aren't getting primary voltage to the coilsor injector pulse,you could have a blown fuse or bad crank sensor.

Sep 07, 2012 | Cars & Trucks

1 Answer

94 Toyota Corolla engine problems

Take a compression test on # 4. It may be a little oil burning w coolant getting by the head gasket. POSSIBLE faulty injector or not firing on time. Ck for any oil in the anti freeze or anti freeze in the oil.

Mar 04, 2017 | 1994 Toyota Corolla

1 Answer

94 toyota corolla engine problems

should be idling roughly
engine check light on ?

faulty coil ok when cold no good when hot

do a compression test on number four
no compression on cylinder four

leaking intake or exhaust valves
the injector isnt working
if everything looks ok and no better
a blown head gasket

Mar 21, 2017 | Toyota Corolla Cars & Trucks

1 Answer

I was having a problem with the engine cutting out, so I changed the spark plugs and filled the tank with good gas and fuel injector cleaner, and now it is missing worse than before. What is the problem?

it could be anything but i would say you should check the ignition coils first. you can do this by testing the resistance in the coil packs. make sure the engine is off and the key is not in the ignition. if you set your voltmeter to ohms take the 2 ignition wires off of one coil pack. touch your voltmeter lead wires to the 2 posts on the ignition coil. it should read 4000-8000 ohms if you have a bad coil it will usually be close to 0 ohms. do this test for all coil packs. each coil pack ignites 2 cylinders so if you have a v6 you will need to test 3 packs and 4 packs on a v8

Apr 02, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

I just bought a 1986 fiero 2.8 v6 when i start the car it run about 5,000 rpms and will not come down to an idle

Check the EGR tube that bolts to the bottom of the upper intake (close to the throttle body) to the EGR Valve for cracks. Also check for Vacuum leaks. Also have the cold start system check for problems. The COLD START INJECTOR SWITCH might be bad.(The cold start injector switch activates the cold start injector on all V-6 Fieros. This switch turns on the cold start injector on initial start up to get the engine to start quicker and run smoother when it is cold.)

Jul 30, 2008 | 1986 Pontiac Fiero

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

84 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides